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Could someone please identify these rocks? Hoping to use them in a saltwater aquarium

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  • $\begingroup$ Please improve your question by reading this answer and editing your question with more information. $\endgroup$ – mkennedy Jan 2 '18 at 20:39
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Three layered ones look like either sandstone or limestone with a bit of iron oxides. You can put several droplets of acid and check if they fizz. If they do, that is limestone, but I have seen limestone in that colour only once and think that is more likely to be sandstone.

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